Hymn lyric frustration

Will someone please tell the writers of hymn lyrics (though most are no longer living) that the word “heaven” is clearly a 2 syllable word. Just because a ” ‘ ” is added making the word read “heav’n”, doesn’t mean that this word should suddenly be read/sung as a 1 syllable word. (In fact, “heav’n” still has 2 syllables). Of course, I wouldn’t mind this at all if the lyric writers followed proper verbal immunity etiquette by adding “if you will” or “as it were” or “if you like” or “for lack of a better way of making this word fit the musical measure…”